Compared to the rest of the Greater Portland market, the Oregon City region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 200 sqft. Most buildings in this market are around 1 stories. Most buildings in this market were built in 1991 and are Class B.